Retrieve per host storage usage from QuotaManager.

webkit/quota/usage_tracker.h

Index: webkit/quota/usage_tracker.h
diff --git a/webkit/quota/usage_tracker.h b/webkit/quota/usage_tracker.h
index 258ef160fc2e735611d4a4725e475fefea883efe..c3782adf74ccc132bffabd0788db8b51c0b93d27 100644
--- a/webkit/quota/usage_tracker.h
+++ b/webkit/quota/usage_tracker.h
@@ -43,6 +43,7 @@ class UsageTracker : public QuotaTaskObserver {
   void UpdateUsageCache(QuotaClient::ID client_id,
                         const GURL& origin,
                         int64 delta);
+  void GetCachedHostsUsage(std::map<std::string, int64>* host_usage) const;
   void GetCachedOrigins(std::set<GURL>* origins) const;
   bool IsWorking() const {
     return global_usage_callbacks_.HasCallbacks() ||
@@ -92,6 +93,7 @@ class ClientUsageTracker : public SpecialStoragePolicy::Observer,
   void GetGlobalUsage(GlobalUsageCallback* callback);
   void GetHostUsage(const std::string& host, HostUsageCallback* callback);
   void UpdateUsageCache(const GURL& origin, int64 delta);
+  void GetCachedHostsUsage(std::map<std::string, int64>* host_usage) const;
   void GetCachedOrigins(std::set<GURL>* origins) const;
 
  private:
@@ -110,7 +112,7 @@ class ClientUsageTracker : public SpecialStoragePolicy::Observer,
   void GatherGlobalUsageComplete();
   void GatherHostUsageComplete(const std::string& host);
 
-  int64 GetCachedHostUsage(const std::string& host);
+  int64 GetCachedHostUsage(const std::string& host) const;
   int64 GetCachedGlobalUnlimitedUsage();
   virtual void OnSpecialStoragePolicyChanged() OVERRIDE;
   void NoopHostUsageCallback(